/* SPDX-License-Identifier: GPL-2.0 */
#pragma once

#if defined(CONFIG_MMU)
static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
									 unsigned long address,
									 pgtbl_mod_mask *mod_mask)
{
	if (unlikely(pgd_none(*pgd)))
	{
		if (__p4d_alloc(mm, pgd, address))
			return NULL;
		*mod_mask |= PGTBL_PGD_MODIFIED;
	}

	return p4d_offset(pgd, address);
}

static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
									 unsigned long address,
									 pgtbl_mod_mask *mod_mask)
{
	if (unlikely(p4d_none(*p4d)))
	{
		if (__pud_alloc(mm, p4d, address))
			return NULL;
		*mod_mask |= PGTBL_P4D_MODIFIED;
	}

	return pud_offset(p4d, address);
}

static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
									 unsigned long address,
									 pgtbl_mod_mask *mod_mask)
{
	if (unlikely(pud_none(*pud)))
	{
		if (__pmd_alloc(mm, pud, address))
			return NULL;
		*mod_mask |= PGTBL_PUD_MODIFIED;
	}

	return pmd_offset(pud, address);
}
#endif /* CONFIG_MMU */

#define pte_alloc_kernel_track(pmd, address, mask) \
	((unlikely(pmd_none(*(pmd))) &&                \
	  (__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0; })))          \
		 ? NULL                                    \
		 : pte_offset_kernel(pmd, address))
